236 The Ohio Journal of Science [Vol. XIX, No. 4, 



always green. The shape of the leaf resembles rather closely 

 the more typical Red Maple leaf, but the Samaras in shape and 

 color are quite unlike those of any other Red Maple. 



Acer rubrum L. var. rubro carpum n. var. 



Leaves large, S-9 cm. long, 9-10 cm. broad across the apices of the 

 lateral lobes, firm, green with red veins, glabrous above, glaucous 

 underneath with cobwebby golden hairs on the veins; the three main 

 lobes are broad, blunt, the terminal one oblong with distinctly parallel 

 sides, each lobe is lobed again; margin sparingly dentate, teeth large; 

 base of leaf subcordate with shallow sinus, almost truncate. Petioles 

 red, stout, 6-7.5 cm. long. Unfolding leaves deep red, lower surface 

 densely covered with reddish golden hairs. Bud scales deep red, 

 margin lighter, covered with long interwoven golden hairs. One 3^ear 

 old twigs red, glabrous, older ones reddish gray. Flowers of carpellate 

 tree with brilliant rose calyx and corolla; stamens apparently fully 

 developed, deep red, carpels with deep red ovularies and styles. Mature 

 samaras glabrous, shining, deep purple red, with no trace of green; 

 wings 2-2.5 cm. long, slender, straight, widely divergent, broadest at 

 tip; seed cavity small and slender, 6-7 mm. by 4-5 mm. Fruiting 

 pedicels 3-5 cm. long, very slender, deep red. Staminate tree unkown. 



The stamens in the carpellate flowers contained apparently 

 fully developed pollen, but it failed to germinate. Tree young, 

 8 m. tall, slender; bark smooth light gray. The leaves unfold 

 later than those of the new variety viride, as can be seen by 

 comparing the photos, both of which were taken May 11, 1918. 



The deep red of the buds, young twigs, flowers, mature 

 fruit and unfolding leaves make this tree conspicuous even 

 among Red Maples. In general, proximity to the water on 

 Cranberry Island causes a marked increase in anthocyan; but 

 this tree stands quite near the center of the Island and is easily 

 the reddest of all the trees. 



The broad firm leaves resemble those of A. drummondii, but 

 the samaras are entirely different. 



Type tree Cranberry Island, Buckeye Lake, Ohio. 



Type specimens in the herbarium of the Department of 

 Botany, Ohio State University. 



Paratype specimens in the national herbarium, Washington, 

 D. C. 



In order to show the characters which distinguish the above 

 described varieties of Acer rubrum from the other species which 

 most closely resemble them I append a key to the species of 

 Engler and Prantle's section Rubra occurring in the United 

 States. 



